Adaptive frequency compensation for DC-to-DC converter
View Patent ↗One embodiment of the invention is a compensation circuit that includes a comparator that is coupled to receive a reference voltage. The compensation circuit can also include a capacitance coupled to receive a feedback voltage associated with an output voltage of a converter. Furthermore, the compensation circuit can include an adjustable resistance that is coupled to the capacitance and to the comparator.
1. A method comprising:
establishing an adjustable capacitance of a compensation circuit at an upper value;
determining whether a transient feedback voltage exceeds a predefined range, said transient feedback voltage is associated with an output voltage of a converter circuit; and
establishing said adjustable capacitance at a lower value, in response to said transient feedback voltage exceeding said predefined range.
2. The method of claim 1 , further comprising:
increasing said adjustable capacitance to a higher value when said transient feedback voltage crosses a reference voltage value, after said transient feedback voltage exceeds said predefined range.
3. The method of claim 2 , wherein said increasing is performed at each odd numbered occurrence that said transient feedback voltage crosses said reference voltage value.
4. The method of claim 3 , wherein said increasing is performed until said upper value is reached.
5. The method of claim 1 , wherein said compensation circuit is part of a buck converter.
6. The method of claim 1 , wherein said compensation circuit is part of a boost converter.
7. The method of claim 1 , wherein said predefined range is a delta percentage plus or minus said reference voltage.
8. A compensation circuit comprising:
means for establishing an adjustable resistance of said compensation circuit at an upper value;
means for determining whether a transient feedback voltage exceeds a predefined range, said transient feedback voltage is associated with an output voltage of a converter circuit; and
means for establishing said adjustable resistance at a lower value, in response to said transient feedback voltage exceeding said predefined range.
9. The compensation circuit of claim 8 , further comprising:
means for increasing said adjustable resistance to a higher value when said transient feedback voltage crosses a reference voltage value, after said transient feedback voltage exceeds said predefined range.
10. The compensation circuit of claim 9 , wherein said increasing is performed at each odd numbered occurrence that said transient feedback voltage crosses said reference voltage value.
11. The compensation circuit of claim 10 , wherein said increasing is performed until said upper value is reached.
12. The compensation circuit of claim 8 , wherein said compensation circuit is part of a buck converter.
13. The compensation circuit of claim 8 , wherein said compensation circuit is part of a boost converter.
14. The compensation circuit of claim 8 , wherein said predefined range is a delta percentage plus or minus said reference voltage.
15. A compensation circuit comprising:
means for establishing an adjustable capacitance of said compensation circuit at an upper value;
means for determining whether a transient feedback voltage exceeds a predefined range, said transient feedback voltage is associated with an output voltage of a converter circuit; and
means for establishing said adjustable capacitance at a lower value, in response to said transient feedback voltage exceeding said predefined range.
16. The compensation circuit of claim 15 , further comprising:
means for increasing said adjustable capacitance to a higher value when said transient feedback voltage crosses a reference voltage value, after said transient feedback voltage exceeds said predefined range.
17. The compensation circuit of claim 16 , wherein said increasing is performed at each odd numbered occurrence that said transient feedback voltage crosses said reference voltage value.
18. The compensation circuit of claim 17 , wherein said increasing is performed until said upper value is reached.
19. The compensation circuit of claim 15 , wherein said compensation circuit is part of a buck converter or a boost converter.
20. The compensation circuit of claim 15 , wherein said predefined range is a delta percentage plus or minus said reference voltage.